Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/*
 * Generic UHCI HCD (Host Controller Driver) for Platform Devices
 *
 * Copyright (c) 2011 Tony Prisk <linux@prisktech.co.nz>
 *
 * This file is based on uhci-grlib.c
 * (C) Copyright 2004-2007 Alan Stern, stern@rowland.harvard.edu
 */
 
#include <linux/of.h>
#include <linux/device.h>
#include <linux/platform_device.h>
 
static int uhci_platform_init(struct usb_hcd *hcd)
{
<------>struct uhci_hcd *uhci = hcd_to_uhci(hcd);
 
<------>/* Probe number of ports if not already provided by DT */
<------>if (!uhci->rh_numports)
<------><------>uhci->rh_numports = uhci_count_ports(hcd);
 
<------>/* Set up pointers to to generic functions */
<------>uhci->reset_hc = uhci_generic_reset_hc;
<------>uhci->check_and_reset_hc = uhci_generic_check_and_reset_hc;
 
<------>/* No special actions need to be taken for the functions below */
<------>uhci->configure_hc = NULL;
<------>uhci->resume_detect_interrupts_are_broken = NULL;
<------>uhci->global_suspend_mode_is_broken = NULL;
 
<------>/* Reset if the controller isn't already safely quiescent. */
<------>check_and_reset_hc(uhci);
<------>return 0;
}
 
static const struct hc_driver uhci_platform_hc_driver = {
<------>.description =		hcd_name,
<------>.product_desc =		"Generic UHCI Host Controller",
<------>.hcd_priv_size =	sizeof(struct uhci_hcd),
 
<------>/* Generic hardware linkage */
<------>.irq =			uhci_irq,
<------>.flags =		HCD_MEMORY | HCD_DMA | HCD_USB11,
 
<------>/* Basic lifecycle operations */
<------>.reset =		uhci_platform_init,
<------>.start =		uhci_start,
#ifdef CONFIG_PM
<------>.pci_suspend =		NULL,
<------>.pci_resume =		NULL,
<------>.bus_suspend =		uhci_rh_suspend,
<------>.bus_resume =		uhci_rh_resume,
#endif
<------>.stop =			uhci_stop,
 
<------>.urb_enqueue =		uhci_urb_enqueue,
<------>.urb_dequeue =		uhci_urb_dequeue,
 
<------>.endpoint_disable =	uhci_hcd_endpoint_disable,
<------>.get_frame_number =	uhci_hcd_get_frame_number,
 
<------>.hub_status_data =	uhci_hub_status_data,
<------>.hub_control =		uhci_hub_control,
};
 
static int uhci_hcd_platform_probe(struct platform_device *pdev)
{
<------>struct device_node *np = pdev->dev.of_node;
<------>struct usb_hcd *hcd;
<------>struct uhci_hcd	*uhci;
<------>struct resource *res;
<------>int ret;
 
<------>if (usb_disabled())
<------><------>return -ENODEV;
 
<------>/*
<------> * Right now device-tree probed devices don't get dma_mask set.
<------> * Since shared usb code relies on it, set it here for now.
<------> * Once we have dma capability bindings this can go away.
<------> */
<------>ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
<------>if (ret)
<------><------>return ret;
 
<------>hcd = usb_create_hcd(&uhci_platform_hc_driver, &pdev->dev,
<------><------><------>pdev->name);
<------>if (!hcd)
<------><------>return -ENOMEM;
 
<------>uhci = hcd_to_uhci(hcd);
 
<------>res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
<------>hcd->regs = devm_ioremap_resource(&pdev->dev, res);
<------>if (IS_ERR(hcd->regs)) {
<------><------>ret = PTR_ERR(hcd->regs);
<------><------>goto err_rmr;
<------>}
<------>hcd->rsrc_start = res->start;
<------>hcd->rsrc_len = resource_size(res);
 
<------>uhci->regs = hcd->regs;
 
<------>/* Grab some things from the device-tree */
<------>if (np) {
<------><------>u32 num_ports;
 
<------><------>if (of_property_read_u32(np, "#ports", &num_ports) == 0) {
<------><------><------>uhci->rh_numports = num_ports;
<------><------><------>dev_info(&pdev->dev,
<------><------><------><------>"Detected %d ports from device-tree\n",
<------><------><------><------>num_ports);
<------><------>}
<------><------>if (of_device_is_compatible(np, "aspeed,ast2400-uhci") ||
<------><------>    of_device_is_compatible(np, "aspeed,ast2500-uhci") ||
<------><------>    of_device_is_compatible(np, "aspeed,ast2600-uhci")) {
<------><------><------>uhci->is_aspeed = 1;
<------><------><------>dev_info(&pdev->dev,
<------><------><------><------> "Enabled Aspeed implementation workarounds\n");
<------><------>}
<------>}
 
<------>/* Get and enable clock if any specified */
<------>uhci->clk = devm_clk_get(&pdev->dev, NULL);
<------>if (IS_ERR(uhci->clk)) {
<------><------>ret = PTR_ERR(uhci->clk);
<------><------>goto err_rmr;
<------>}
<------>ret = clk_prepare_enable(uhci->clk);
<------>if (ret) {
<------><------>dev_err(&pdev->dev, "Error couldn't enable clock (%d)\n", ret);
<------><------>goto err_rmr;
<------>}
 
<------>ret = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_SHARED);
<------>if (ret)
<------><------>goto err_clk;
 
<------>device_wakeup_enable(hcd->self.controller);
<------>return 0;
 
err_clk:
<------>clk_disable_unprepare(uhci->clk);
err_rmr:
<------>usb_put_hcd(hcd);
 
<------>return ret;
}
 
static int uhci_hcd_platform_remove(struct platform_device *pdev)
{
<------>struct usb_hcd *hcd = platform_get_drvdata(pdev);
<------>struct uhci_hcd *uhci = hcd_to_uhci(hcd);
 
<------>clk_disable_unprepare(uhci->clk);
<------>usb_remove_hcd(hcd);
<------>usb_put_hcd(hcd);
 
<------>return 0;
}
 
/* Make sure the controller is quiescent and that we're not using it
 * any more.  This is mainly for the benefit of programs which, like kexec,
 * expect the hardware to be idle: not doing DMA or generating IRQs.
 *
 * This routine may be called in a damaged or failing kernel.  Hence we
 * do not acquire the spinlock before shutting down the controller.
 */
static void uhci_hcd_platform_shutdown(struct platform_device *op)
{
<------>struct usb_hcd *hcd = platform_get_drvdata(op);
 
<------>uhci_hc_died(hcd_to_uhci(hcd));
}
 
static const struct of_device_id platform_uhci_ids[] = {
<------>{ .compatible = "generic-uhci", },
<------>{ .compatible = "platform-uhci", },
<------>{}
};
MODULE_DEVICE_TABLE(of, platform_uhci_ids);
 
static struct platform_driver uhci_platform_driver = {
<------>.probe		= uhci_hcd_platform_probe,
<------>.remove		= uhci_hcd_platform_remove,
<------>.shutdown	= uhci_hcd_platform_shutdown,
<------>.driver = {
<------><------>.name = "platform-uhci",
<------><------>.of_match_table = platform_uhci_ids,
<------>},
};